Below are 30 Most-Asked MCQs from CBSE Class 10 – Life Processes (Respiration)
Prepared year-wise (based on repeated appearance in past CBSE Board Exams & Sample Papers) and arranged in a clean, exam-ready format.
📘 CBSE CLASS 10 – RESPIRATION
⭐ 30 MOST IMPORTANT MCQs (YEAR-WISE TREND)
1. The process of breakdown of glucose in the presence of oxygen is called:
(a) Fermentation
(b) Anaerobic respiration
(c) Aerobic respiration
(d) Glycolysis
📅 Asked in: 2016, 2019, 2023
2. Which gas is released during anaerobic respiration in yeast?
(a) Oxygen
(b) Hydrogen
(c) Carbon dioxide
(d) Nitrogen
📅 Asked in: 2015, 2020
3. The site of gaseous exchange in human lungs is:
(a) Bronchi
(b) Trachea
(c) Alveoli
(d) Larynx
📅 Asked in: 2014, 2018, 2022
4. Which of the following has the highest concentration of oxygen?
(a) Inhaled air
(b) Exhaled air
(c) Alveolar air
(d) Blood
📅 Asked in: 2017, 2021
5. During respiration, energy is released in the form of:
(a) Heat
(b) ATP
(c) ADP
(d) Glucose
📅 Asked in: 2016, 2020, 2024
6. The breakdown of glucose into pyruvate takes place in:
(a) Mitochondria
(b) Ribosome
(c) Cytoplasm
(d) Nucleus
📅 Asked in: 2018, 2023
7. Which structure prevents food from entering the windpipe?
(a) Larynx
(b) Epiglottis
(c) Pharynx
(d) Trachea
📅 Asked in: 2015, 2019
8. In anaerobic respiration in muscles, glucose is converted into:
(a) Alcohol
(b) CO₂ and water
(c) Lactic acid
(d) Acetic acid
📅 Asked in: 2016, 2022
9. The energy released per molecule of glucose in aerobic respiration is about:
(a) 2 ATP
(b) 4 ATP
(c) 36 ATP
(d) 100 ATP
📅 Asked in: 2014, 2020
10. Which part of the respiratory system contains cartilaginous rings?
(a) Bronchioles
(b) Trachea
(c) Alveoli
(d) Pharynx
📅 Asked in: 2017, 2021
11. The movement of diaphragm during inhalation is:
(a) Upward
(b) Downward
(c) No movement
(d) Sideways
📅 Asked in: 2018, 2023
12. Which of the following organisms shows anaerobic respiration?
(a) Human
(b) Frog
(c) Yeast
(d) Fish
📅 Asked in: 2016, 2019
13. The end products of aerobic respiration are:
(a) CO₂ and alcohol
(b) CO₂ and water
(c) Lactic acid
(d) Ethanol and CO₂
📅 Asked in: 2015, 2020, 2024
14. Which gas is transported by haemoglobin?
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Hydrogen
📅 Asked in: 2017, 2022
15. The respiratory pigment in human blood is:
(a) Chlorophyll
(b) Myoglobin
(c) Haemoglobin
(d) Plasma
📅 Asked in: 2014, 2019
16. Which part of the brain controls breathing?
(a) Cerebellum
(b) Medulla
(c) Cerebrum
(d) Hypothalamus
📅 Asked in: 2018, 2021
17. Exchange of gases in lungs occurs by:
(a) Osmosis
(b) Active transport
(c) Diffusion
(d) Mass flow
📅 Asked in: 2016, 2020
18. Which blood vessels carry oxygenated blood from lungs to heart?
(a) Pulmonary artery
(b) Vena cava
(c) Pulmonary vein
(d) Aorta
📅 Asked in: 2017, 2023
19. The number of lungs in humans is:
(a) One
(b) Two
(c) Three
(d) Four
📅 Asked in: 2015, 2021
20. Which structure increases surface area for gas exchange?
(a) Bronchi
(b) Bronchioles
(c) Alveoli
(d) Trachea
📅 Asked in: 2016, 2019, 2024
21. During exhalation, the diaphragm moves:
(a) Downwards
(b) Upwards
(c) Sideways
(d) No movement
📅 Asked in: 2016, 2020, 2022
22. The process of release of energy from food is called:
(a) Digestion
(b) Respiration
(c) Excretion
(d) Assimilation
📅 Asked in: 2015, 2019
23. Which of the following conditions is necessary for efficient gaseous exchange in alveoli?
(a) Thick walls
(b) Dry surface
(c) Rich blood supply
(d) Low surface area
📅 Asked in: 2018, 2023
24. In plants, exchange of gases occurs mainly through:
(a) Roots
(b) Stomata
(c) Xylem
(d) Phloem
📅 Asked in: 2017, 2020
25. The energy currency of the cell is:
(a) DNA
(b) RNA
(c) ATP
(d) ADP
📅 Asked in: 2014, 2019, 2024
26. Which of the following is NOT a respiratory organ?
(a) Lungs
(b) Gills
(c) Skin
(d) Heart
📅 Asked in: 2016, 2021
27. The incomplete breakdown of glucose in absence of oxygen is called:
(a) Aerobic respiration
(b) Anaerobic respiration
(c) Transpiration
(d) Photosynthesis
📅 Asked in: 2015, 2018
28. In plants, respiration occurs:
(a) Only during day
(b) Only during night
(c) Only in leaves
(d) All the time
📅 Asked in: 2017, 2022
29. Which of the following increases breathing rate?
(a) Sleeping
(b) Sitting
(c) Running
(d) Resting
📅 Asked in: 2016, 2020
30. The main function of respiration is to:
(a) Remove waste
(b) Produce oxygen
(c) Release energy
(d) Store food
📅 Asked in: 2014, 2018, 2023
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